Benchmark: timing 10000 iterations of block, for, while... block: 8 wallclock secs ( 8.13 usr + 0.00 sys = 8.13 CPU) for: 8 wallclock secs ( 7.90 usr + 0.00 sys = 7.90 CPU) while: 8 wallclock secs ( 8.03 usr + 0.00 sys = 8.03 CPU) Benchmark: timing 20000 iterations of block, for, while... block: 16 wallclock secs (16.25 usr + 0.00 sys = 16.25 CPU) for: 16 wallclock secs (15.80 usr + 0.00 sys = 15.80 CPU) while: 16 wallclock secs (16.08 usr + 0.00 sys = 16.08 CPU) Benchmark: timing 30000 iterations of block, for, while... block: 24 wallclock secs (24.37 usr + 0.00 sys = 24.37 CPU) for: 24 wallclock secs (23.69 usr + 0.00 sys = 23.69 CPU) while: 24 wallclock secs (24.08 usr + 0.00 sys = 24.08 CPU) Benchmark: timing 80000 iterations of block, for, while... block: 66 wallclock secs (65.01 usr + 0.00 sys = 65.01 CPU) for: 63 wallclock secs (63.18 usr + 0.00 sys = 63.18 CPU) while: 64 wallclock secs (64.20 usr + 0.00 sys = 64.20 CPU)